Remedies for collecting and enforcing rates and charges set out in this chapter are cumulative and may be pursued alternately, or any thereof may be used consecutively when the legislative body so determines. If any one of said remedies is or may be invalid, all valid remedies shall remain effectual until the principal and interest of the bonds are fully paid. Any holder of any bond outstanding at any time may compel the use of any or all of the remedies herein provided. The costs of collection and enforcement of the remedies for the collection of charges may be paid from the revenues.